/* Node Highlight Overlay */
.node-highlight {
  position: fixed;
  pointer-events: none;
  z-index: 999;
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease;
}

.node-highlight.hidden {
  opacity: 0;
  pointer-events: none;
}

.highlight-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.9);
}

.highlight-ring-outer {
  width: 60px;
  height: 60px;
  animation: pulse-outer 1s ease-in-out infinite;
}

.highlight-ring-inner {
  width: 40px;
  height: 40px;
  border-width: 3px;
  animation: pulse-inner 1s ease-in-out infinite;
  animation-delay: 0.15s;
}

@keyframes pulse-outer {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.9;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.4);
    opacity: 0.3;
  }
}

@keyframes pulse-inner {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.7;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.3);
    opacity: 0.2;
  }
}